To sum up , there are three main ways of tackling the problem...

概括起来说，这一问题主要有三种解决办法…

《牛津词典》

In crude terms , the causes of mental illness seem to be of three main kinds.

简略地说，导致精神病的原因看起来主要有三种。

《牛津词典》

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Ray Romano,John Leguizamo and Dennis Leary return as the voices of the three main animal characters.

VOA: special.2009.06.12

The seaport is one of three main sites in Mogadishu protected by the AMISOM forces.

VOA: standard.2009.09.26

Kunda Dixit,editor of Nepali Times, says the three main parties are refusing to step aside because they want a decisive say in the writing of the new constitution.

VOA: standard.2010.07.29

If the Privy Council wanted to make changes to the charter it would not have to get the approval of the leaders of the three main political parties.

BBC: Parties say Tory post-Leveson plan 'basis for talks'

As Scotland has bowed out of two of the three main international education surveys, it is a challenge to offer a clear picture of the current state of play in school education, apart from exam results.

BBC: A year in Scotland's education

The contest offered a foretaste of what is to come when, for the first time in a British general election, the leaders of the three main parties will slug it out in prime time.

ECONOMIST: A television contest for the worst job in politics